Para&#39;-amino-ortho-benzoyl-benzoic acid and process of making the same



Patented Dec. 27, 1927.

Umrso STATES V PATENT OFFICE.

IVAN GUBELMANZN', OF SOUTH MILWAUKEE, WISCONSIN, ASSIGNOR TO THE NEWPORT COMPANY, OF CARROLLVILLE, WISCONSIN, CORPORATIQN OF DELAWARE.

PARA'-AMINOORTll-IO-BENZOYL-BENZOIG'ACID AND PROCESS OF MAKING THE SAME.

No Drawing.

5 isomeric with other known amino-ortho-benzoyl-benzoic' acids, such as: ortho-benzoylmeta-ammo-benzolc acld, described 1n Chemv .ische Zentr'alblatt 1908 (2) page 1028; orthobenzoyl-para-amino-benzoic acid, Berichte l 38, page 296; ortho-benzoyl-ortho-aminobenzoic acid, Jr. Amer. Chem. Soc. 42, page 1871 ortho amino ortho benzoyl benzoic acid, Chemische Zentralblatt 1913 (I), page 1481; meta amino ortho benzoyl benzoic l5 acid, Ghemische Zentralblatt 1904; (I), page benzoyl-benzoic acid can 329. Thepara-amino-ortho-benzoyl-benzoic acid, however, has not to the bestoi my vknowledge been described in the literature.

I have now found that ara-amino-orthohe obtained by the replacement of the halogen group in parahalogen-ortho-benaoyl-benzoic acid by an amino group. The chemical reaction is expressed as follows, wherein (hlg) represents a halogen atom Xylene orchloro-benzene at ordinary temperatures, but is readily soluble in alcohol, glacial acetic acid and nitro-benzene. It is slightly soluble in cold water, but appreclably Application filed December 8, 1926. Serial No. 153,468.

so in. dilute \hydrochloric acid. In concentrated sulphuric acid, it dissolves readily, imparting a red brown color to the solution. It readily forms an acetyl derivative with a melting point of 277 C. With aqueous ammonia, caustic soda and caustic potash solutions, the corresponding salts are formed, which are very soluble in cold water.

Without limiting my invention to any particular procedure, the following example, in which parts by weight .are given, illustrates the application of my invention in the preferred form;

10 parts of the sodium salt of para-chloro- OI'lihOrbBIlZOYl'bQflZOlC acid are mixed with 80 parts of 26% aqueous ammonia. and .5.

parts of copper sulphate as catalyst. The mixture isthen heated to ISO-185 C. using a pressure autoclave provided with an a itator, and this temperature is maintaine for eighteen hours. At this temperature, the

pressure will approximate 450 pounds. At

the end of this period the reaction mass is cooled and the excess ammonia distilled oif.

The mass is now made distinctly alkaline with caustic soda, boiled and filtered hot. The filtrate is cooled and slowly added to 100 arts of 3% cold hydrochloric acid. The who e is warmed to 45 C. and filtered to remove any insoluble residue. The filtrate is now exactly neutralized with caustic soda, cooled. and the para-amino-ortho-benzoylbenz'oic acid filtered oil. This compound is purified by recrystallization from water. It may also be purified by dissolving in a minimum quantity of hot 5% hydrochloric acid solution and cooling to separate out the hydrochloride of the compound.

I am aware that numerous details of the process may be varied through a wide range without departing from the spirit of this invention, and I do not desire limiting the patent granted; hereon otherwise than as necessitated by the prior art.

I claim as my invention:

1. The process of preparing para'-aminoortho-benzoyl-benzoic acid, which comprises heating para halogen-ortho-henzoyl-benzoic acid with aqueous ammonia under pressure.

2. The process of preparinl para -amin0- amino-ortho-benzoyl benz0ic acid having th ortho-benzoyl-benzoic acid, w heating para halogen-ortho-benzoyhbenzoic acid wit aqueous ammonia under pressure in the presence of a catalyst.

3. The process of preparing paral-aminoortho-benzoyl-benzoic acid, which comprises heating para-halogen-orthobenzoyl-benzoic acid with aqueous ammonia under pressure in the presence of a copper catalyst.

4. The process of preparing para'-aminoortho-benzoyl-benzoic acid, which comprises heating para chloro ortho benzoyl-benzoic acid with aqueous ammonia under pressure in the presence of copper as catalyst.

5. As a new article of manufacture, paraich comprises following formula: I

scribed my name.

IVAN GUBELMANN. 

